I have the same behavior of a timeout on "GET_VERSION" for SIM connection in Android Oreo 8.1 running LineageOS 15.1.The rSAP connection works as well but it asks for the PIN code after disconnect from my car.When installing the system files (MK.II) the SIM connection is even green but then after reboot it goes into timeout again.

Maybe the Google implementation of rSAP takes over and is not disabled correctly?